Mosquito season in Emmet County, IA: when it starts and ends
Mosquito months in Emmet County
In a normal year mosquito season in Emmet County, IA starts around April 27 and ends around October 10, about 24 weeks.
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
What to do in Emmet County, and when
- Start tipping out standing water weekly by April 13.
- Book any yard treatment for late April, ahead of the July peak.
- Repellent can go away after October 10.
- 2 West Nile cases since 2016 (last 2025): you should use repellent at dusk July to July, more so if over 60.
Emmet County against the rest of IA
Emmet County has the 96th longest season of 99 IA counties, at 166 days against 198 in Des Moines County and 160 in Worth County. Its mean temperature is 44.7°F.
- Fayette County: April 27 to October 11 (167 days, 1 WNV)
- Chickasaw County: April 27 to October 10 (166 days, 2 WNV)
- Osceola County: April 28 to October 11 (166 days, 2 WNV)
- Howard County: April 29 to October 10 (164 days, 0 WNV)
West Nile in Emmet County
From 1999 to 2025, CDC ArboNET counted 6 human West Nile cases in Emmet County (6 neuroinvasive) across 4 years. The worst was 2006 with 3; the latest was 2025.
Background: when mosquitoes go away for the winter; how the dates are worked out.